ul.ztree{
    border:none !important;
    background-color: #F2F2F2;
    height: auto;
    padding-bottom: 100px;
    margin: 0px auto;
    padding-left: 50px;
}

#treeDemo{
    margin-top: 20px;
    border: 1px solid #C1C1C1;
}
body{
    background: #F6F7F9;
}
.ztree * {
    font-size: 14px;
    color: #7F7F7F;
}
.ztree li{
    line-height:2em;
}
#p_id{
    text-align:center;
    margin-top: 20px;
}
#p_id span{
    color: red;
}